NAME

Log::Log4perl::Appender::RRDs - Log to a RRDtool Archive

SYNOPSIS

use Log::Log4perl qw(get_logger);
use RRDs;

my $DB = "myrrddb.dat";

RRDs::create(
  $DB, "--step=1",
  "DS:myvalue:GAUGE:2:U:U",
  "RRA:MAX:0.5:1:120");

print time(), "\n";

Log::Log4perl->init(\qq{
  log4perl.category = INFO, RRDapp
  log4perl.appender.RRDapp = Log::Log4perl::Appender::RRDs
  log4perl.appender.RRDapp.dbname = $DB
  log4perl.appender.RRDapp.layout = Log::Log4perl::Layout::PatternLayout
  log4perl.appender.RRDapp.layout.ConversionPattern = N:%m
});

my $logger = get_logger();

for(10, 15, 20, 25) {
    $logger->info($_);
    sleep 1;
}

DESCRIPTION

"Log::Log4perl::Appender::RRDs" appenders facilitate writing data to RRDtool round-robin archives via Log4perl. For documentation on RRD and its Perl interface "RRDs" (which comes with the distribution), check out http://rrdtool.org.

Messages sent to Log4perl's RRDs appender are expected to be numerical values (ints or floats), which then are used to run a "rrdtool update" command on an existing round-robin database. The name of this database needs to be set in the appender's "dbname" configuration parameter.

If there's more parameters you wish to pass to the "update" method, use the "rrdupd_params" configuration parameter:

log4perl.appender.RRDapp.rrdupd_params = --template=in:out

To read out the round robin database later on, use "rrdtool fetch" or "rrdtool graph" for graphic displays.

LICENSE

Copyright 2002-2026 by Mike Schilli <m@perlmeister.com> and Kevin Goess <cpan@goess.org>.

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.